I suspect its that - generally when you write a heap it needs to keep some metadata. if you have a multi-heap system (really handy), then its generally easier t

I suspect its that - generally when you write a heap it needs to keep some metadata. if you have a multi-heap system (really handy), then its generally easier to host that metadata on another heap. sometimes you really want that, because the target heap might be specialized for different kinds of data. so I assume this is carefully constructing the heap state so that it can be used for its own metadata as its being constructed